Soulsby Oscitron Manuel utilisateur

IMPORTANT SAFETY INSTRUCTIONS

•Read all the instructions before use.

•Do not position the module in direct sunlight or in areas

subject to heat, moisture, dust, cold or vibration.

•Clean the module with a damp cloth while switched off. Do not

use solvents or abrasive cleaners.

•Do not apply excessive force to any of the switches and knobs.

•The module is capable of producing audio levels that could

cause hearing loss. Do not plug headphones directly into the

audio output of the module. It is Eurorack voltage, which is

substantially higher than headphone voltage. If you experience

ringing in your ears after use, consult an audiologist.

•The EEPROM that stores patches has a life of 100,000

write/erase cycles. You may find it becomes unreliable after

this. The FRAM that stores user waves has a life of 100 trillion

write/erase cycles.

•THE POWER CABLE MUST BE CONNECTED WITH THE RED

IDENT FACING DOWN.

•Do not attempt to service the module. Contact Soulsby

Synthesizers if your Oscitron stops working.

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Justin Owen (Abstract Data), Oli Horton (DREAMTRAK), James Weiner,

Steve Dawson, Neil Kagan and anyone else who has provided me with

information, advice and their time!

Introduction

Thank you for purchasing the Oscitron by Soulsby Synthesizers. We feel

certain that it will provide you with a whole world of new sounds and

creativity.

The controls have been designed to be intuitive and there are no complex

menu systems or sequences of button presses. The Oscitron is hackable

which means that completely different audio engines can be easily

uploaded to it via an FTDI cable and PC or Mac. This means that you have

effectively purchased an ever-growing number of modules, rather than

just the one!

The first section of this manual provides you with all the information for

basic operation of the Oscitron. The next chapters go through each

feature in detail. Following that there is an audio engine system diagram

and tables of certain sound parameters.

Oscitron parameters such as function names or physical connections are

highlighted in red.

Please take time to visit soulsbysynths.com where you can find more

information, including the latest news and downloads.

Specification

Inputs: 2x 0-5V 1V/Oct, 3x 0-5V CV, 1x 5V clock, 1x -/+5V audio, all 100kΩ

Outputs: 1x -/+5V audio output 1kΩ

Power Requirements: +/-12V via 10-pin IDC connector

Current Draw: +12V: 130mA approx., -12V: 70mA approx., +5V: 0mA

Width: 14HP Depth: 26mm from back panel, including IDC connector

Contents: Oscitron, 4x 10mm M3 screws, 4x 10mm M2.5 screws, 16-pin to

10-pin IDC cable, Quick Ref card, manual

Contents

Connections................................................................................................................. 3!

Basic Operation .........................................................................................................5!

Overview.................................................................................................................................... 5!

Function and Value Dials.................................................................................................. 5!

Inputs and Output..................................................................................................................7!

Functions .....................................................................................................................11!

Waveform Select.................................................................................................................. 11!

Audio Engine Resolution ................................................................................................. 11!

Coarse Frequency.............................................................................................................. 12!

Quantizer Scale.....................................................................................................................13!

Minimum Sample Length .............................................................................................. 14!

Filter Type............................................................................................................................... 14!

Wave Crusher....................................................................................................................... 16!

Load/Save Patch ..................................................................................................................17!

Inputs............................................................................................................................ 18!

Freq............................................................................................................................................ 18!

Pulse W.................................................................................................................................... 18!

Filt Freq ................................................................................................................................... 18!

Filter Res..................................................................................................................................19!

Phaser .......................................................................................................................................19!

Clock...........................................................................................................................................19!

Input............................................................................................................................................19!

Output ........................................................................................................................... 19!

Hacking....................................................................................................................... 20!

System Diagram ..................................................................................................... 21!

Audio Waveforms.................................................................................................. 22!

Quantize Scales...................................................................................................... 23!

Filter Types...............................................................................................................24!

Clock Input Global Settings.............................................................................. 25!

Wave Crusher Presets........................................................................................ 26!

Connections

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Function

dial

Value

knob

Value

dial

1V/Oct input 0-5V

Software driven tune knob

1V/Oct input 0-5V

Software driven tune knob

CV input 0-5V

Hardware 0-5V bias knob

CV input 0-5V

Hardware 0-5V bias knob

CV input 0-5V

Hardware 0-5V bias knob

0-5V clock input (also

can take CV)

-5 - +5V

audio input

-5 - +5V

audio output

Function

knob

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10 pin

power IDC

RED

FTDI header

BLACK

ICSP header

(not used)

Basic Operation

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The Oscitron is an 8-bit wavetable oscillator, with an audio engine

architecture based on the Atmegatron MIDI desktop synth.

It has some major differences from the Atmegatron that add features that

make it more suitable for Eurorack users. Many parameters are

controllable via CV inputs and there is an audio input for sampling User

Waveforms.

8-bit means that the sound is calculated digitally using 8-bit values

(integer numbers between 0 and 255). This is how home computers

worked in the 1980s and the Oscitron excels at creating these kinds of

sounds. However the processor is far more powerful than those in 80s

home computers, so it is packed with features never possible in that era.

Control of the Oscitron can be divided into the following areas:

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The function dial is on the top and the value dial is

on the bottom. By looking at the position of the lit

red LED and the corresponding symbol on the

dial, you can see what the current function is and

its value.

In this example, the function is set to Filter Type

and the value is set to 9(low shelf filter) as shown

by the outer ring on the value dial.

To change the Filter Type, turn the value knob

and the circular LED will change position. For

example if you want to change the Filter Type to a

low pass filter (LPF), turn the knob until the LED

next to 1on the inner dial is lit. There is a symbol

representing a low pass filter on the outer ring of

Function dial

Value dial

the value dial.

The full list of filter types and their corresponding symbols can be found

on page 24.

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The function knob can be pushed in and when

you do this, it changes from glowing red to green

(and vice versa). Each function on the function

dial has a green mode, which is activated by

briefly pushing the knob (< 2 secs).

For example turn the function knob so that

Waveform Select is highlighted. Listen to the

output. Now press the knob on the function dial,

so it glows green. You will hear that the sound

changes. This is because you are now in the

green bank of waveforms. If you turn the value

dial you can hear all the different waveforms in

the green bank.

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Some functions also have an associated global setting. Pressing and

holding the Function knob when the relevant function is selected can

access these. After 2 seconds it will flash and turn yellow. The value of

the global function can then be selected with the Value knob. This value is

stored in EEPROM and is global to all patches (sounds), not just the

current one. A short press of the Function knob will leave the global

setting mode and the knobs and dials will return to their normal values.

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To load or save a sound, turn the function knob to the load/save symbol (it

looks like a 5¼” floppy disk!)

To load a sound, turn the value knob to the patch number you require,

then briefly press the function knob.

To save a sound, turn the value knob to the patch number you want to

save over, and then hold the function knob down for at least 2 seconds.

The knob will flash when it is finished. The previous patch will be lost.

See page 17 for more information.

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The Oscitron has 2 1V/Oct inputs. There is an associated tune knob that

adjusts the parameter in software.

There are 3 CV inputs each with an offset knob. The offset knob adds a 0-

5V bias and can also be used to manually set the relevant parameter

when no input is connected.

There is a Clock input that triggers the waveform sampling of the audio

Input by default. However this input has many other options which are

described on page 19.

The Audio Input is used to sample User Waveforms into memory. The

Output is a standard Eurorack voltage (-5 to +5V) audio output.

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The examples 1-4 overleaf show how the Oscitron can sample

waveforms via the audio input. Sampling is initiated by either pressing

the Value knob or by a pulse at the Clock input. Sampling starts and stops

when the incoming audio crosses 0V whilst rising from a negative to

positive voltage (known as a “zero crossing”).

The Input Length parameter sets the minimum number of samples to

store and can be used to eliminate erroneous waveforms captured

because of noise around 0V or to capture more complex timbres with

multiple zero crossings.

The state of the waveform sampling is shown by the colour of the Value

knob. This is shown in the examples.

Example 1: páåÖäÉ=ï~îÉÑçêã=ë~ãéäáåÖ. Initially the waveform is set

to sine wave (red bank 9). This just demonstrates the output sound before

sampling. Sampling is initiated (value knob turns yellow). It starts writing

to the sample buffer when a zero crossing is detected at the input (value

knob turns red). It passes the Input Length value, which is low (e.g. 0= 4

samples). It stops when another zero crossing is detected at the input

(value knob turns green). The stored waveform is stretched to the

current audio engine resolution (see page 11) and outputted after a zero

crossing at the output. This is at the pitch defined by the oscillator

frequency parameters (1V/Oct input, fine & coarse tune, range).

Example 2: _ìÑÑÉê=çîÉêêìå. The maximum buffer length for sampling

is 256 samples. If the incoming waveform does not cross 0V before

reaching the end of the 256 sample buffer, it will abort the capture and

the value knob will remain red.

Example 3: eáÖÜÉê=î~äìÉ=Ñçê=fåéìí=iÉåÖíÜ. As example 1, but 2

wave cycles are stored because the minimum input length hasn’t been

reached once the first cycle is complete and this allows a more complex

timbre to be sampled. The stored waveform is still stretched to the audio

engine resolution and will therefore sound at twice the pitch of a single

cycle waveform (because 2 cycles are stored rather than 1). The values for

Input Length are below.

Input Length

Value

Minimum waveform

samples

128

192

224

240

252

Example 4: `çåíáåìçìë=ë~ãéäáåÖ=ãçÇÉ. As example 1, but sampling

restarts as soon as the previous sampled wave is outputted. This creates

a vocoder-style effect, although the actual process has nothing to do with

a vocoder. The Input Length is still changeable and creates variations in

timbre.

Input

Ex. 1

Ex. 2

Idle Start:

wait for

zero cross

Sampling Complete

Output

Idle Start:

wait for

zero cross

Sampling Buffer overrun - wave too long

Sampled wave not outputted

Min Input Length

Wait for zero cross

Sine wave

(red bank, 9)

Sine wave

(red bank, 9)

Wave stretched to audio

res. and output

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